Keep in mind when you run a 2 speed you do away with the slipper clutch and puts much stress on the drive train! Defiantly not a good idea for off road ore jumping.

Keep in mind catbutt runs mostly on sand and is very hard on a vehicle. I do agree unless you are running a big block or an engine like the OS TZ that has as much HP as some big blocks keep the stock diff housings. Now if I read it correctly the new MT 2+ has better diff housings.